getting AppleScript to Duplicate file from numbers (understanding arguments)

AppleScript is nothing like any other language I have used.. cant figure out what should be so simple.

I am just trying to make a script that would create a local back up of an open document. ( I will reopen the original iCloud version afterwards, but cant get past the saveas)

I tried to use "SAVE <document> IN <Path>" but couldn't figure it out, switched to "DUPLICATE" and am still stuck...

I failed so many times on SAVE, I tried DUPLICATE thinking might be better.

you can see I have tried multiple different things, cant figure out why it keeps failing with different errors that I don't understand. (I commented the error first then the line that throws that error)

These same kinds of things came up with the ability to ?"Save <document> in <path>"

tell application "Numbers"
	set filePath to file of front document
	set the_name to name of front document
	
	set theNewFilePath to "Macintosh HD:Users:MyName:Documents:backups:numbers:"
    --cant make the <filepath> into type location specifier... its literally saying use the 
    -- front document and filepath came from another script 
    -- that makes it for me that i found online and it seems to be the riught format from others  
 --duplicate front document to theNewFilePath

    --Cant get Document whose name is... but it got the name from the front document?
 --duplicate (the document whose name is the_name) to theNewFilePath
	
    --Cant make <filename> into type specifier ... what the heck is this specifier type?
 --duplicate the_name to theNewFilePath
end tell

Any help would be greatly appreciated

Jason